1 /*- 2 * Copyright (c) 1998 Nicolas Souchu 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/dev/iicbus/if_ic.c,v 1.8 1999/12/29 04:35:39 peter Exp $ 27 * $DragonFly: src/sys/dev/netif/ic/if_ic.c,v 1.17 2006/12/22 23:26:20 swildner Exp $ 28 */ 29 30 /* 31 * I2C bus IP driver 32 */ 33 34 #ifdef _KERNEL 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 #include <sys/mbuf.h> 39 #include <sys/socket.h> 40 #include <sys/filio.h> 41 #include <sys/sockio.h> 42 #include <sys/kernel.h> 43 #include <sys/module.h> 44 #include <sys/bus.h> 45 #include <sys/time.h> 46 #include <sys/malloc.h> 47 #include <sys/thread2.h> 48 49 #include <net/if.h> 50 #include <net/ifq_var.h> 51 #include <net/if_types.h> 52 #include <net/netisr.h> 53 54 #endif 55 #include <sys/mbuf.h> 56 #include <sys/socket.h> 57 #include <net/netisr.h> 58 #include <net/route.h> 59 #include <netinet/in.h> 60 #include <netinet/in_systm.h> 61 #include <netinet/in_var.h> 62 #include <netinet/ip.h> 63 #include <netinet/if_ether.h> 64 65 #include <net/bpf.h> 66 67 #include <bus/iicbus/iiconf.h> 68 #include <bus/iicbus/iicbus.h> 69 70 #include "iicbus_if.h" 71 72 #define ICHDRLEN sizeof(uint32_t) 73 #define ICMTU 1500 /* default mtu */ 74 75 struct ic_softc { 76 struct ifnet ic_if; 77 78 u_char ic_addr; /* peer I2C address */ 79 80 int ic_sending; 81 82 char *ic_obuf; 83 char *ic_ifbuf; 84 char *ic_cp; 85 86 int ic_xfercnt; 87 88 int ic_iferrs; 89 }; 90 91 static devclass_t ic_devclass; 92 93 static int icprobe(device_t); 94 static int icattach(device_t); 95 96 static int icioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 97 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 98 struct rtentry *); 99 100 static void icintr(device_t, int, char *); 101 102 static device_method_t ic_methods[] = { 103 /* device interface */ 104 DEVMETHOD(device_probe, icprobe), 105 DEVMETHOD(device_attach, icattach), 106 107 /* iicbus interface */ 108 DEVMETHOD(iicbus_intr, icintr), 109 110 { 0, 0 } 111 }; 112 113 static driver_t ic_driver = { 114 "ic", 115 ic_methods, 116 sizeof(struct ic_softc), 117 }; 118 119 /* 120 * icprobe() 121 */ 122 static int 123 icprobe(device_t dev) 124 { 125 return (0); 126 } 127 128 /* 129 * icattach() 130 */ 131 static int 132 icattach(device_t dev) 133 { 134 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 135 struct ifnet *ifp = &sc->ic_if; 136 137 sc->ic_addr = iicbus_get_addr(dev); 138 139 ifp->if_softc = sc; 140 if_initname(ifp, "ic", device_get_unit(dev)); 141 ifp->if_mtu = ICMTU; 142 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 143 ifp->if_ioctl = icioctl; 144 ifp->if_output = icoutput; 145 ifp->if_type = IFT_PARA; 146 ifp->if_hdrlen = 0; 147 ifp->if_addrlen = 0; 148 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); 149 150 if_attach(ifp, NULL); 151 152 bpfattach(ifp, DLT_NULL, ICHDRLEN); 153 154 return (0); 155 } 156 157 /* 158 * iciotcl() 159 */ 160 static int 161 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 162 { 163 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit); 164 device_t parent = device_get_parent(icdev); 165 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 166 167 struct ifaddr *ifa = (struct ifaddr *)data; 168 struct ifreq *ifr = (struct ifreq *)data; 169 170 u_char *iptr, *optr; 171 int error; 172 173 switch (cmd) { 174 175 case SIOCSIFDSTADDR: 176 case SIOCAIFADDR: 177 case SIOCSIFADDR: 178 if (ifa->ifa_addr->sa_family != AF_INET) 179 return EAFNOSUPPORT; 180 ifp->if_flags |= IFF_UP; 181 /* FALLTHROUGH */ 182 case SIOCSIFFLAGS: 183 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 184 185 /* XXX disable PCF */ 186 ifp->if_flags &= ~IFF_RUNNING; 187 188 /* IFF_UP is not set, try to release the bus anyway */ 189 iicbus_release_bus(parent, icdev); 190 break; 191 } 192 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 193 194 if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR))) 195 return (error); 196 197 sc->ic_obuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN, 198 M_DEVBUF, M_WAITOK); 199 if (!sc->ic_obuf) { 200 iicbus_release_bus(parent, icdev); 201 return ENOBUFS; 202 } 203 204 sc->ic_ifbuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN, 205 M_DEVBUF, M_WAITOK); 206 if (!sc->ic_ifbuf) { 207 iicbus_release_bus(parent, icdev); 208 return ENOBUFS; 209 } 210 211 iicbus_reset(parent, IIC_FASTEST, 0, NULL); 212 213 ifp->if_flags |= IFF_RUNNING; 214 } 215 break; 216 217 case SIOCSIFMTU: 218 /* save previous buffers */ 219 iptr = sc->ic_ifbuf; 220 optr = sc->ic_obuf; 221 222 /* allocate input buffer */ 223 sc->ic_ifbuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK); 224 if (!sc->ic_ifbuf) { 225 226 sc->ic_ifbuf = iptr; 227 sc->ic_obuf = optr; 228 229 return ENOBUFS; 230 } 231 232 /* allocate output buffer */ 233 sc->ic_ifbuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK); 234 if (!sc->ic_obuf) { 235 236 kfree(sc->ic_ifbuf,M_DEVBUF); 237 238 sc->ic_ifbuf = iptr; 239 sc->ic_obuf = optr; 240 241 return ENOBUFS; 242 } 243 244 if (iptr) 245 kfree(iptr,M_DEVBUF); 246 247 if (optr) 248 kfree(optr,M_DEVBUF); 249 250 sc->ic_if.if_mtu = ifr->ifr_mtu; 251 break; 252 253 case SIOCGIFMTU: 254 ifr->ifr_mtu = sc->ic_if.if_mtu; 255 break; 256 257 case SIOCADDMULTI: 258 case SIOCDELMULTI: 259 if (ifr == 0) { 260 return EAFNOSUPPORT; /* XXX */ 261 } 262 switch (ifr->ifr_addr.sa_family) { 263 264 case AF_INET: 265 break; 266 267 default: 268 return EAFNOSUPPORT; 269 } 270 break; 271 272 default: 273 return EINVAL; 274 } 275 return 0; 276 } 277 278 /* 279 * icintr() 280 */ 281 static void 282 icintr (device_t dev, int event, char *ptr) 283 { 284 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 285 int unit = device_get_unit(dev); 286 int len; 287 struct mbuf *top; 288 289 crit_enter(); 290 291 switch (event) { 292 293 case INTR_GENERAL: 294 case INTR_START: 295 sc->ic_cp = sc->ic_ifbuf; 296 sc->ic_xfercnt = 0; 297 break; 298 299 case INTR_STOP: 300 301 /* if any error occured during transfert, 302 * drop the packet */ 303 if (sc->ic_iferrs) 304 goto err; 305 306 if ((len = sc->ic_xfercnt) == 0) 307 break; /* ignore */ 308 309 if (len <= ICHDRLEN) 310 goto err; 311 312 len -= ICHDRLEN; 313 sc->ic_if.if_ipackets ++; 314 sc->ic_if.if_ibytes += len; 315 316 BPF_TAP(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN); 317 318 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0); 319 320 if (top) 321 netisr_dispatch(NETISR_IP, top); 322 break; 323 324 err: 325 kprintf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs); 326 327 sc->ic_iferrs = 0; /* reset error count */ 328 sc->ic_if.if_ierrors ++; 329 330 break; 331 332 case INTR_RECEIVE: 333 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) { 334 sc->ic_iferrs ++; 335 336 } else { 337 *sc->ic_cp++ = *ptr; 338 sc->ic_xfercnt ++; 339 } 340 break; 341 342 case INTR_NOACK: /* xfer terminated by master */ 343 break; 344 345 case INTR_TRANSMIT: 346 *ptr = 0xff; /* XXX */ 347 break; 348 349 case INTR_ERROR: 350 sc->ic_iferrs ++; 351 break; 352 353 default: 354 panic("%s: unknown event (%d)!", __func__, event); 355 } 356 357 crit_exit(); 358 } 359 360 /* 361 * icoutput() 362 */ 363 static int 364 icoutput(struct ifnet *ifp, struct mbuf *m, 365 struct sockaddr *dst, struct rtentry *rt) 366 { 367 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit); 368 device_t parent = device_get_parent(icdev); 369 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 370 int len, sent; 371 struct mbuf *mm; 372 u_char *cp; 373 uint32_t hdr = dst->sa_family; 374 375 ifp->if_flags |= IFF_RUNNING; 376 377 crit_enter(); 378 379 /* already sending? */ 380 if (sc->ic_sending) { 381 ifp->if_oerrors ++; 382 goto error; 383 } 384 385 /* insert header */ 386 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 387 388 cp = sc->ic_obuf + ICHDRLEN; 389 len = 0; 390 mm = m; 391 do { 392 if (len + mm->m_len > sc->ic_if.if_mtu) { 393 /* packet to large */ 394 ifp->if_oerrors ++; 395 goto error; 396 } 397 398 bcopy(mtod(mm,char *), cp, mm->m_len); 399 cp += mm->m_len; 400 len += mm->m_len; 401 402 } while ((mm = mm->m_next)); 403 404 if (ifp->if_bpf) 405 bpf_ptap(ifp->if_bpf, m, &hdr, ICHDRLEN); 406 407 sc->ic_sending = 1; 408 409 m_freem(m); 410 411 crit_exit(); 412 413 /* send the packet */ 414 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 415 len + ICHDRLEN, &sent)) 416 417 ifp->if_oerrors ++; 418 else { 419 ifp->if_opackets ++; 420 ifp->if_obytes += len; 421 } 422 423 sc->ic_sending = 0; 424 425 return (0); 426 427 error: 428 m_freem(m); 429 crit_exit(); 430 431 return(0); 432 } 433 434 DECLARE_DUMMY_MODULE(if_ic); 435 DRIVER_MODULE(if_ic, iicbus, ic_driver, ic_devclass, 0, 0); 436 437